Kayla Simmons shows off her taut tummy in workout vid as world’s sexiest volleyball star gets sweaty in gym

KAYLA SIMMONS delighted fans with her latest workout video. The former college athlete, 30, has built an army of fans online. Kayla has nearly one million Instagram followers, and loves to keep them up to date with what she's up to. This includes her extensive array of workout routines, as she keeps in excellent shape...